Could you please describe your application: rH7Cv/Y 1, is the emitting source single mode or multimode? what are the parameters i.e. divergence, waist, ... :!aLa}`@ 2, is the fiber single mode or multimode? what is the NA, core dia,... v2;E W p 1/-3m Po Generally, fiber coupling efficiency of 40%~90% is reasonable. 1M`E.Ztw* ]9YA~n\ Again let us know your specific bug. p/Ul[7A4e 8eB,$;i MANG2004 E)*ht;u